package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;

import java.util.Map;

@Service
public class UserServiceImpl implements UserService {
    public static final String WX_LOGIN="https://api.weixin.qq.com/sns/jscode2session";
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WeChatProperties weChatProperties;

    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        String openid = getOpenid(userLoginDTO.getCode());
        //判断openid是否为 null 如果为null 抛出异常
        if (openid==null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //根据openid获取User对象
      User user =  userMapper.getByOpenid(openid);
        //判断user是否为null 如果为null添加用户 如果不为null直接返回对象
        if (user==null){
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.add(user);

        }

        return user;
    }
    private String getOpenid(String code){
        //获取openid key是固定只可以去微信开发小程序找
        Map<String,String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        //调用http请求工具 获得json类型的字符串
        String json = HttpClientUtil.doGet(WX_LOGIN, map);
        //使用方法返回JSONObject对象
        JSONObject jsonObject = JSON.parseObject(json);
        //获取openid
        String openid = jsonObject.getString("openid");
        return openid;
    }

}